Abstract
A RECENT paper (J. Chem. Soc., 1930, p. 478) showed that the direct solvent action of dilute sulphuric acid on ferric oxide films is very slow. The rapid, removal of a ferric oxide film from iron by acid is due to the formation of the local cell iron/acid/ferric oxide, which produces cathodic reduction of the ferric oxide to the rapidly soluble ferrous oxide. If the whole surface receives anodic treatment, this cathodic reduction is prevented, and hence an iron anode may remain passive in acid solution.
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EVANS, U. Isolation of the Film Responsible for the Passivity of an Iron Anode in Acid Solution. Nature 126, 130–131 (1930). https://doi.org/10.1038/126130b0
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DOI: https://doi.org/10.1038/126130b0
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